DOCSLIB.ORG

Instrument Performance Enhancement and Modification Through an Extended Instrument Paradigm

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Instrument Performance Enhancement and Modification Through an Extended Instrument Paradigm University of Tennessee, Knoxville TRACE: Tennessee Research and Creative Exchange Doctoral Dissertations Graduate School 12-2000 Instrument Performance Enhancement and Modification through an Extended Instrument Paradigm Stephen L. Mahan University of Tennessee - Knoxville Follow this and additional works at: https://trace.tennessee.edu/utk_graddiss Part of the Physics Commons Recommended Citation Mahan, Stephen L., "Instrument Performance Enhancement and Modification through an Extended Instrument Paradigm. " PhD diss., University of Tennessee, 2000. https://trace.tennessee.edu/utk_graddiss/2005 This Dissertation is brought to you for free and open access by the Graduate School at TRACE: Tennessee Research and Creative Exchange. It has been accepted for inclusion in Doctoral Dissertations by an authorized administrator of TRACE: Tennessee Research and Creative Exchange. For more information, please contact [email protected]. To the Graduate Council: I am submitting herewith a dissertation written by Stephen L. Mahan entitled "Instrument Performance Enhancement and Modification through an Extended Instrument Paradigm." I have examined the final electronic copy of this dissertation for form and content and recommend that it be accepted in partial fulfillment of the equirr ements for the degree of Doctor of Philosophy, with a major in Physics. William E. Blass, Major Professor We have read this dissertation and recommend its acceptance: Chia C. Shih, Thomas Handler, Hamparsum Bozdogan Accepted for the Council: Carolyn R. Hodges Vice Provost and Dean of the Graduate School (Original signatures are on file with official studentecor r ds.) To the Graduate Council: I am submitting herewith a dissertation written by Stephen L. Mahan entitled “Instrument Performance Enhancement and ModiÞca- tion through an Extended Instrument Paradigm.” I have examined the Þnal copy of this dissertation for form and content and recommend that it be accepted in partial fulÞllment of the requirements for the degree of Doctor of Philosophy, with a major in Physics. William E. Blass, Major Professor We have read this dissertation and recommend its acceptance: Accepted for the Council: Interim Vice Provost and Dean of The Graduate School Instrument Performance Enhancement and Modification through an Extended Instrument Paradigm A Dissertation Presented for the Doctor of Philosophy Degree The University of Tennessee, Knoxville Stephen L. Mahan December 2000 Copyright c Stephen L. Mahan, 2000 ° All rights reserved ii Dedication To my Father iii Acknowledgement I would like to acknowledge the support and encouragement from my father and mother. I would also like to acknowledge Albert, Leon, Connie and Holly for their unwaivering support. I would like to especially acknowledge the supervision and friendship of Professor Blass as well as the encouragement from and collaboration with the students and staff of the UT Complex Systems Laboratory. I would like to thank Kermit Duckett for his friendship. Much of this work has been inspired from discussions with the staff of the Laboratory for Extraterrestrial Physics at Goddard Space Flight Center. Dr. Larry Senesac and Dr. Alberto Rodriguez have been an encouragement and I would like to acknowledge their support through discussions and assistance especially in the area of Positron Emission Tomography. If it were not for Alberto, we probably would not have crossed this road. And the work Larry has done, often when I was overwhelmed, helped in the computational implementation of the Þltered-backprojection reconstruction algorithm as well as discussions leading to insight into this and other problems in many areas of research. I would like to thank the Department of Physics for providing funding through teaching and research assistantships. Also I acknowledge Gordon Chin and John Hillman for support as a NASA/GSFC GSRP fellow from 1992-1995 as well as valuable discussions, opportunities and collaborations throughout the years. It is my pleasure also to acknowledge three Þne professors who have each inspired me and encouraged me throughout the years. My thanks go out to each of them for having so kindly agreed to serve on my doctoral committee. Professor Shih has provided insight into many areas of life such as health, family and also research and teaching. Professor Handler has been an encouragement ever since the days in the late 80s when I transferred to UT as an undergraduate. And then Professor Bozdogan has been incredibly supportive and we have enjoyed some fun collaborations with the implementation of information complexity to images. There are several other friends who have been so supportive through the years, I would like to say that without these friendships this work would not have been possible. I want to thank Vig, Mark, Dan, Bill and so many others at ASIC international for their support and encouragement in Þnishing this endeavor. iv Abstract An extended instrument paradigm is proposed, developed and shown in various applica- tions. The CBM (Chin, Blass, Mahan) method is an extension to the linear systems model of observing systems. In the most obvious and practical application of image enhancement of an instrument characterized by a time-invariant instrumental response function, CBM can be used to enhance images or spectra through a simple convolution application of the CBM Þlter for a resolution improvement of as much as a factor of two. The CBM method can be used in many ap- plications. We discuss several within this work including imaging through turbulent atmospheres, or what we’ve called Adaptive Imaging. Adaptive Imaging provides an alternative approach for the investigator desiring results similar to those obtainable with adaptive optics, however on a minimal budget. The CBM method is also used in a backprojected Þltered image reconstruction method for Positron Emission Tomography. In addition, we can use information theoretic meth- ods to aid in the determination of model instrumental response function parameters for images having an unknown origin. Another application presented herein involves the use of the CBM method for the determination of the continuum level of a Fourier transform spectrometer ob- servation of ethylene, which provides a means for obtaining reliable intensity measurements in an automated manner. We also present the application of CBM to hyperspectral image data of the comet Shoemaker-Levy 9 impact with Jupiter taken with an acousto-optical tunable Þlter equipped CCD camera to an adaptive optics telescope. v Table of Contents 1. Introduction ............................................... 1 1.1 Motivation ............................................. 1 1.2 Review of Resolution Enhancement Systems ................ 3 1.2.1 Linear Image Enhancement Systems ....................... 3 1.2.2 Non-Linear Image Enhancement Systems ................... 6 1.3 Structure of the Dissertation .............................. 7 2. Early Results of Enhancement with CBM ...................... 9 2.1 Early Historical View .................................... 9 2.2 Image Restoration and Super-Resolution by Novel Applications of a Neural Network ........................ 16 2.2.1 Introduction .......................................... 16 2.2.2 Image and Spectrum Recovery ........................... 17 2.2.2.1 General Procedure .................................. 17 2.2.2.2 HST-Like and HST Image Reconstruction .............. 18 2.2.3 Recovery of Spectra .................................... 24 2.2.3.1 Tunable Diode Laser Spectroscopy .................... 24 2.2.3.2 Numerical Apodization ............................. 24 2.2.3.3 Numerical Apodization Plus Spectral Recovery: FTS Spectrum ..................................... 27 2.2.3.4 Deconvolution by a Novel Neural Network .............. 27 2.2.4 Conclusions ........................................... 29 vi 2.3 Image enhancement and the convolution connection neural network ........................................ 30 2.3.1 Convolution Connection Paradigm Neural Network ......... 32 2.3.2 Examples ............................................. 36 2.3.3 Conclusions ........................................... 43 3. CBM on a Sound Theoretical Basis .......................... 44 3.1 Taking Control of the Instrument Response Function ........ 44 3.1.1 Fredholm Integral or the Convolution Equation ............. 45 3.1.2 A New Instrument Design Paradigm ...................... 46 3.1.2.1 Introduction ....................................... 47 3.1.2.2 Direct Recovery of the Object (Θ) .................... 48 3.1.2.3 The Neural Network Approach to Recovery of the Object (Θ) ..................................... 48 3.1.3 A More Detailed look at the Novel ArtiÞcial Neural Network and Solution to the Convolution Equation ......... 52 3.1.4 Illustrative Examples ................................... 56 3.1.5 Theoretical Insights .................................... 60 3.2 Applied CBM - Structural Forms ......................... 62 3.2.1 Iterative CBM ......................................... 62 3.2.2 Fourier Transform Based CBM ........................... 63 4. Applications of CBM ...................................... 65 4.1 Image Enhancement for ScientiÞc Research: Jovian Comet Crash .......................................... 65 4.1.1 Introduction .......................................... 65 vii 4.1.2 Objective ............................................. 66 4.1.3 Method ............................................... 66 4.1.4 Results ..............................................
Load more

Recommended publications
  • Virgo the Virgin
    Virgo the Virgin Virgo is one of the constellations of the zodiac, the group tion Virgo itself. There is also the connection here with of 12 constellations that lies on the ecliptic plane defined “The Scales of Justice” and the sign Libra which lies next by the planets orbital orientation around the Sun. Virgo is to Virgo in the Zodiac. The study of astronomy had a one of the original 48 constellations charted by Ptolemy. practical “time keeping” aspect in the cultures of ancient It is the largest constellation of the Zodiac and the sec- history and as the stars of Virgo appeared before sunrise ond - largest constellation after Hydra. Virgo is bordered by late in the northern summer, many cultures linked this the constellations of Bootes, Coma Berenices, Leo, Crater, asterism with crops, harvest and fecundity. Corvus, Hydra, Libra and Serpens Caput. The constella- tion of Virgo is highly populated with galaxies and there Virgo is usually depicted with angel - like wings, with an are several galaxy clusters located within its boundaries, ear of wheat in her left hand, marked by the bright star each of which is home to hundreds or even thousands of Spica, which is Latin for “ear of grain”, and a tall blade of galaxies. The accepted abbreviation when enumerating grass, or a palm frond, in her right hand. Spica will be objects within the constellation is Vir, the genitive form is important for us in navigating Virgo in the modern night Virginis and meteor showers that appear to originate from sky. Spica was most likely the star that helped the Greek Virgo are called Virginids.
    [Show full text]
  • Terry Adrian's Finest NGC Chart/Log System
    RASC FINEST NGC No. NGC Con Type R.A. Dec m_v Size Remarks Seen Date Autumn 1 7009 Aqr PN 21:04.2 -11:02 8.3 25" !! Saturn Nebula; small bright oval 2 7293 Aqr PN 22:29.6 -20:48 6.5 12'50" !! Helix Nebula; large, diffuse; use filter 3 7331 Peg G-Sb 22:37.1 +34:25 9.5 10.7x4.0 !! large, bright spiral galaxy 4 7635 Cas EN 23:20.7 +61:12 - 15x8 Bubble Neb.; very faint; 1/2 deg SW of M52 5 7789 Cas OC 23:57.0 +56:44 6.7 16 !! 300*; faint but very rich cluster 6 185 Cas G-E0 00:39.0 +48:20 11.7 2x2 companion to M31; paired with NGC 147 7 281 Cas EN 00:52.8 +56:36 - 35x30 !! large faint nebulosity near eta Cas 8 457 Cas OC 01:19.1 +58:20 6.4 13 80*; rich; one of the best Cas clusters 9 663 Cas OC 01:46.0 +61:15 7.1 16 80*; look for NGC's 654 and 659 nearby 10 I 289 Cas PN 03:10.3 +61:19 12.3 34" dim oval smudge; use nebula filter 11 7662 And PN 23:25.9 +42:33 9.2 20" !! Blue Snowball; annular at high power 12 891 And G-Sb 02:22.6 +42:21 10 13.5x2.8 !! faint, classic edge-on with dust lane 13 253 Scl G-Scp 00:47.6 -25:17 7.1 25.1x7.4 !! very large and bright but at low altitude 14 772 Ari G-Sb 01:59.3 +19:01 10.3 7.1x4.5 diffuse spiral galaxy 15 246 Cet PN 00:47.0 -11:53 8.0 3'45" faint (closer to 11 m); dark mottling 16 936 Cet G-SBa 02:27.6 -01:09 10.1 5.2x4.4 near M77; NGC 941 in the same field 17 869/84 Per OC 02:20.0 +57:08 ~4.4 30/30 !! Double Cluster; 350*; use low mag.
    [Show full text]
  • ACA News Apr 04.Pub
    The Night Sky Astronomy Club of Akron Astronomy Club of Akron Akron, OH USA http://www.acaoh.org The Night Sky APRIL 2004 Presidential Musings Physics at Kent State University, Membership Renewal Stark Branch. Many ACA mem- By Gregg Crenshaw bers may remember Bernie as he Now is the time to renew your has spoken at meetings in the membership in the Astronomy On Sunday, March 28 a group of past. His talk will be entitled Club of Akron. ACA members visited the Cleve- “Relativity, Is it Really Relative? land Museum of Natural History. Membership includes: Clyde Simpson, Coordinator of Come to the business meeting the Ralph Mueller Observatory and vote for the person of your • A one year subscription to at the museum took the group on choice for ACA officers for the the club's monthly newsletter a “behind the scenes” tour to year. • Discounts on subscriptions places many of us didn’t know for Sky & Telescope or As- existed. The group started out, tronomy magazines naturally, in the observatory. NEXT MEETING • Use of loaner telescopes Clyde pointed the 10.5” refractor • Access to the Portage Lakes at Venus. Everyone enjoyed Ve- State Park Observatory nus’s crescent shape on a rare • An open invitation to all club partly cloudy day. We also activities. looked at a good size sunspot April 23 group as Clyde projected the so- 8:00 PM Dues are $20.00 a year for lar image on a large white card. Adults (18 and over), $15.00 for We then visited many laborato- Kiwanis Hall.
    [Show full text]
  • San Jose Astronomical Association Membership Form
    The Messier Marathon at Henry Coe State Park Vivek Mohan It began, like almost all activities, and no amount of tweaking, prodding, However, locating objects without with a groan. “Come on, it’s a Saturday or adjusting it could fix the problem. a viewfinder was proving to be a difficult night, do we have to go to the Messier Using the other scope, we quickly exercise. M81 was the next object on Marathon?” “Let’s watch a movie located the easiest of the Messier the list, and it was more difficult to instead.” It ended, also, with a groan, objects — M42 and M43, otherwise locate than it should have been. We but on a different note — “Are we known as Orion’s Nebula and de decided to take a walk around and look leaving already?” “Can’t we stay a little Mairan’s Nebula (located slightly below at the other telescopes there. Some of longer?” All in all, the Messier Marathon Orion’s belt.) Another easy-to-locate the very large scopes, a 20” scope and at Henry Coe State Park was a fun object, M36, in Auriga, was next. The 18” scope, were next to us. We kept experience. other two Messier objects in Auriga, admiring the scopes themselves, which We loaded our 6” dob (on loan M37 and M38, were easy to find from from SJAA) and drove over to our there. Continued on next page friend’s house. Mr. Kumar brought his 6” equatorial and his 10 year old son, SJAA activities calendar Jim Van Nuland “When it was time to leave, my younger brother and I May June asked for the traditional 3 Deep sky weekend.
    [Show full text]
  • Monthly Observer's Challenge
    MONTHLY OBSERVER’S CHALLENGE Las Vegas Astronomical Society Compiled by: Roger Ivester, Boiling Springs, North Carolina & Fred Rayworth, Las Vegas, Nevada With special assistance from: Rob Lambert, Las Vegas, Nevada JUNE 2016 Introduction The purpose of the Observer’s Challenge is to encourage the pursuit of visual observing. It’s open to everyone that’s interested, and if you’re able to contribute notes, and/or drawings, we’ll be happy to include them in our monthly summary. We also accept digital imaging. Visual astronomy depends on what’s seen through the eyepiece. Not only does it satisfy an innate curiosity, but it allows the visual observer to discover the beauty and the wonderment of the night sky. Before photography, all observations depended on what the astronomer saw in the eyepiece, and how they recorded their observations. This was done through notes and drawings, and that’s the tradition we’re stressing in the Observers Challenge. We’re not excluding those with an interest in astrophotography, either. Your images and notes are just as welcome. The hope is that you’ll read through these reports and become inspired to take more time at the eyepiece, study each object, and look for those subtle details that you might never have noticed before. M5 (NGC-5904) Globular Cluster In Serpens Caput M5, also known as NGC-5904 is a globular cluster in Serpens Caput. It was discovered by Gottfried Kirch in 1702 and Charles Messier added it to his catalog in 1764. William Herschel was the first to resolve stars in it in 1791 where he counted around 200 or so.
    [Show full text]
  • June-2021-Observers-Challenge- Ngc
    MONTHLY OBSERVER'S CHALLENGE Compiled by: Roger Ivester, North Carolina & Sue French, New York June 2021 Report #149 NGC 5746, Edge-on Spiral Galaxy in Virgo Sharing Observations and Bringing Amateur Astronomers Together Introduction The purpose of the Observer's Challenge is to encourage the pursuit of visual observing. It's open to everyone who's interested, and if you're able to contribute notes and/or drawings, we’ll be happy to include them in our monthly summary. Visual astronomy depends on what's seen through the eyepiece. Not only does it satisfy an innate curiosity, but it allows the visual observer to discover the beauty and the wonderment of the night sky. Before photography, all observations depended on what astronomers saw in the eyepiece, and how they recorded their observations. This was done through notes and drawings, and that's the tradition we're stressing in the Observer's Challenge. And for folks with an interest in astrophotography, your digital images and notes are just as welcome. The hope is that you'll read through these reports and become inspired to take more time at the eyepiece, study each object, and look for those subtle details that you might never have noticed before. This month's target William Herschel discovered NGC 5746 on 24 February 1786 with his 18.7-inch reflector. His handwritten journal reads:" Extremely bright, much extended in the parallel, 8 or 9 arcminutes long, bright nucleus." A recent study by John Kormendy and Ralf Bender in the Astrophysical Journal presents NGC 5746 as a structural analog of our own galaxy.
    [Show full text]
  • Ephemerides Astronomicae. Anni...Ad Meridianum Mediolanensem
    Informazioni su questo libro Si tratta della copia digitale di un libro che per generazioni è stato conservata negli scaffali di una biblioteca prima di essere digitalizzato da Google nell’ambito del progetto volto a rendere disponibili online i libri di tutto il mondo. Ha sopravvissuto abbastanza per non essere più protetto dai diritti di copyright e diventare di pubblico dominio. Un libro di pubblico dominio è un libro che non è mai stato protetto dal copyright o i cui termini legali di copyright sono scaduti. La classificazione di un libro come di pubblico dominio può variare da paese a paese. I libri di pubblico dominio sono l’anello di congiunzione con il passato, rappresentano un patrimonio storico, culturale e di conoscenza spesso difficile da scoprire. Commenti, note e altre annotazioni a margine presenti nel volume originale compariranno in questo file, come testimonianza del lungo viaggio percorso dal libro, dall’editore originale alla biblioteca, per giungere fino a te. Linee guide per l’utilizzo Google è orgoglioso di essere il partner delle biblioteche per digitalizzare i materiali di pubblico dominio e renderli universalmente disponibili. I libri di pubblico dominio appartengono al pubblico e noi ne siamo solamente i custodi. Tuttavia questo lavoro è oneroso, pertanto, per poter continuare ad offrire questo servizio abbiamo preso alcune iniziative per impedire l’utilizzo illecito da parte di soggetti commerciali, compresa l’imposizione di restrizioni sull’invio di query automatizzate. Inoltre ti chiediamo di: + Non fare un uso commerciale di questi file Abbiamo concepito Google Ricerca Libri per l’uso da parte dei singoli utenti privati e ti chiediamo di utilizzare questi file per uso personale e non a fini commerciali.
    [Show full text]
  • Theory of Stellar Atmospheres
    © Copyright, Princeton University Press. No part of this book may be distributed, posted, or reproduced in any form by digital or mechanical means without prior written permission of the publisher. EXTENDED BIBLIOGRAPHY References [1] D. Abbott. The terminal velocities of stellar winds from early{type stars. Astrophys. J., 225, 893, 1978. [2] D. Abbott. The theory of radiatively driven stellar winds. I. A physical interpretation. Astrophys. J., 242, 1183, 1980. [3] D. Abbott. The theory of radiatively driven stellar winds. II. The line acceleration. Astrophys. J., 259, 282, 1982. [4] D. Abbott. The theory of radiation driven stellar winds and the Wolf{ Rayet phenomenon. In de Loore and Willis [938], page 185. Astrophys. J., 259, 282, 1982. [5] D. Abbott. Current problems of line formation in early{type stars. In Beckman and Crivellari [358], page 279. [6] D. Abbott and P. Conti. Wolf{Rayet stars. Ann. Rev. Astr. Astrophys., 25, 113, 1987. [7] D. Abbott and D. Hummer. Photospheres of hot stars. I. Wind blan- keted model atmospheres. Astrophys. J., 294, 286, 1985. [8] D. Abbott and L. Lucy. Multiline transfer and the dynamics of stellar winds. Astrophys. J., 288, 679, 1985. [9] D. Abbott, C. Telesco, and S. Wolff. 2 to 20 micron observations of mass loss from early{type stars. Astrophys. J., 279, 225, 1984. [10] C. Abia, B. Rebolo, J. Beckman, and L. Crivellari. Abundances of light metals and N I in a sample of disc stars. Astr. Astrophys., 206, 100, 1988. [11] M. Abramowitz and I. Stegun. Handbook of Mathematical Functions. (Washington, DC: U.S. Government Printing Office), 1972.
    [Show full text]
  • The COLOUR of CREATION Observing and Astrophotography Targets “At a Glance” Guide
    The COLOUR of CREATION observing and astrophotography targets “at a glance” guide. (Naked eye, binoculars, small and “monster” scopes) Dear fellow amateur astronomer. Please note - this is a work in progress – compiled from several sources - and undoubtedly WILL contain inaccuracies. It would therefor be HIGHLY appreciated if readers would be so kind as to forward ANY corrections and/ or additions (as the document is still obviously incomplete) to: [email protected]. The document will be updated/ revised/ expanded* on a regular basis, replacing the existing document on the ASSA Pretoria website, as well as on the website: coloursofcreation.co.za . This is by no means intended to be a complete nor an exhaustive listing, but rather an “at a glance guide” (2nd column), that will hopefully assist in choosing or eliminating certain objects in a specific constellation for further research, to determine suitability for observation or astrophotography. There is NO copy right - download at will. Warm regards. JohanM. *Edition 1: June 2016 (“Pre-Karoo Star Party version”). “To me, one of the wonders and lures of astronomy is observing a galaxy… realizing you are detecting ancient photons, emitted by billions of stars, reduced to a magnitude below naked eye detection…lying at a distance beyond comprehension...” ASSA 100. (Auke Slotegraaf). Messier objects. Apparent size: degrees, arc minutes, arc seconds. Interesting info. AKA’s. Emphasis, correction. Coordinates, location. Stars, star groups, etc. Variable stars. Double stars. (Only a small number included. “Colourful Ds. descriptions” taken from the book by Sissy Haas). Carbon star. C Asterisma. (Including many “Streicher” objects, taken from Asterism.
    [Show full text]
  • In This Issue: There Will Be Several Tables Set up in OMSI's Auditorium with Members 1
    The Rosette Gazette Volume 20,, IssueIssue 1 Newsletter of the Rose CityCity AstronomersAstronomers January, 2008 RCA INFORMATION FAIR Monday, January 21st! The January meeting features our annual Information Fair. This is a great opportunity to get acquainted, or reacquainted, with RCA activi- ties and members. In This Issue: There will be several tables set up in OMSI's Auditorium with members 1 .. General Meeting sharing information about RCA programs and activities. The library 2 .. Club Officers will be open with hundreds of astronomy related books and videos. If .... Magazines .... President’s Letter you prefer to purchase books the RCA Sales table will feature a large 3 .. The Observer’s Corner assortment of Astronomy reference books, star-charts, calendars and as- 6 .. Doing Spectroscopy sorted accessories. 8 .. Telescope Workshop .... RCA Library Learn about amateur observing programs such as the Messier, Caldwell .... Science SIG .... Cosmology SIG and Herschel programs. Depending on table allocation, RCA members 9,.. Board Minutes will be displaying programs such as observing the Moon, Planets, Aster- 10. Calendar oids and more. Find out about our Telescope Library where members can check out a variety of telescopes to try out. Find out about the ob- serving site committee and special interest groups. Special interest groups, depending on participation, include Cosmology/Astrophysics, Astrophotography and Amateur Telescope Making. Above all get to know people who share your interests. The fair begins at 7:00 PM, Monday January 21st in the OMSI Auditorium. There will be a short business meeting at 7:30, . Enter at the Planetarium Entrance right (north) of the Main Entrance.
    [Show full text]
  • Observer's Handbook 1982
    OBSERVER’S HANDBOOK 1982 EDITOR: ROY L. BISHOP ROYAL ASTRONOMICAL SOCIETY OF CANADA CONTRIBUTORS AND ADVISORS A l a n H. B a t t e n , Dominion Astrophysical Observatory, Victoria, B .C ., Canada V8X 3X3 (The Nearest Stars). R o y L. B is h o p , Department of Physics, Acadia University, Wolfville, N.S., Canada B0P 1X0 (Editor). Terence Dickinson, R.R. 3, Odessa, Ont., Canada, K0H 2H0, (The Planets). D a v id W. D u n h a m , International Occultation Timing Association, P.O. Box 7488, Silver Spring, Md. 20907, U .S.A . (Planetary Appulses and Occultations). A la n D y e r , Queen Elizabeth Planetarium, 10004-104 Ave., Edmonton, Alta. T5J 0K1 (Messier Catalogue, Deep-Sky Objects). M arie Fidler, Royal Astronomical Society of Canada, 124 Merton St., Toronto, Ont., Canada M4S 2Z2 (Observatories and Planetaria). Victor Gaizauskas, Herzberg Institute of Astrophysics, National Research Council, Ottawa, Ont., Canada K1A 0R6 (Sunspots). J o h n A. G a l t , Dominion Radio Astrophysical Observatory, Penticton, B.C., Canada V2A 6K3 (Radio Sources). Ian H alliday, Herzberg Institute of Astrophysics, National Research Council, Ottawa, Ont., Canada K1A 0R6 (Miscellaneous Astronomical Data). H e l e n S. H o g g , David Dunlap Observatory, University of Toronto, Richmond Hill, Ont., Canada LAC 4Y6 (Foreword). D o n a l d A. M a c R a e , David Dunlap Observatory, University of Toronto, Richmond Hill, Ont., Canada L4C 4Y6 (The Brightest Stars). B r i a n G. M a r s d e n , Smithsonian Astrophysical Observatory, Cambridge, Mass., U.S.A.
    [Show full text]
  • Observatorio Astronómico "Félix Aguilar"
    Observatorio Astronómico "Félix Aguilar" Facultad de Ciencias Exactas, Físicas y Naturales San Juan ANUARIO ASTRONÓMICO 2020 Volumen XXX 2 Anuario Astronómico 2020 – C.C. Mallamaci - J.A.Pérez - Observatorio Astronómico "Félix Aguilar" Facultad de Ciencias Exactas, Físicas y Naturales - Universidad Nacional de San Juan UNIVERSIDAD NACIONAL DE SAN JUAN FACULTAD DE CIENCIAS EXACTAS, FÍSICAS Y NATURALES OBSERVATORIO ASTRONÓMICO “FELIX AGUILAR” ANUARIO ASTRONÓMICO 2020 Claudio Carlos Mallamaci - José Alberto Pérez San Juan - República Argentina - 2020 4 Anuario Astronómico 2020 – C.C. Mallamaci - J.A.Pérez - Observatorio Astronómico "Félix Aguilar" Facultad de Ciencias Exactas, Físicas y Naturales - Universidad Nacional de San Juan Contenido Introducción 7 Fenómenos 9 Sol 11 Fases de la Luna 11 Eclipses y Tránsitos 11 Artículos del calendario 12 Entrada del Sol en los signos del Zodíaco 12 Reporte de las estaciones 12 Perigeo y apogeo de la Luna 12 Fenómenos planetarios geo y heliocéntricos 13 (Mercurio, Venus y planetas superiores) Datos de Planetas 13 Configuración diaria del Sol, Luna y Planetas 14 Sol 19 Luna 27 Tiempo sidéreo y coordenadas del Sol 35 Planetas 43 Posiciones aparentes de estrellas 53 Tablas 95 Refracción Astronómica Normal 95 Correcciones a las Refracciones Normales 96 Calendario 97 5 Anuario Astronómico 2020 – C.C. Mallamaci - J.A.Pérez - Observatorio Astronómico "Félix Aguilar" Facultad de Ciencias Exactas, Físicas y Naturales - Universidad Nacional de San Juan 6 Anuario Astronómico 2020 – C.C. Mallamaci - J.A.Pérez - Observatorio Astronómico "Félix Aguilar" Facultad de Ciencias Exactas, Físicas y Naturales - Universidad Nacional de San Juan Introducción Este anuario astronómico, preparado y publicado por el Observatorio Astronómico "Félix Aguilar", tiene como objeto principal proporcionar, a docentes y aficionados en general, datos útiles sobre temas astronómicos.
    [Show full text]